Color cathode ray tube with subelectrodes

Details Color cathode ray tube with subelectrodes Color cathode ray tube with subelectrodes

1996-04-19

1998-04-28

Horabik, Michael

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313460, 315 14, H01J 2962

Patent

active

057449031

ABSTRACT:
Color cathode ray tube (1) device having an electron gun (6) of the in-line type for generating three electron beams (7,8,9), a display screen (10) and deflection coils (11) for scanning the electron beams over the display screen. The electron gun includes a main lens part for focusing the electron beams on the display screen, the main lens part comprising main lens electrodes (26, 27) having apertures for passing of the electron beams, at least one of said main lens electrodes comprising two sub-electrodes (26a, 26b) adjacent to each other, each of the sub-electrodes having a central (311, 321) and two outer apertures (312, 322, 313, 323), whereby in operation between the adjacent sub-electrodes an astigmatic quadrupole field is generated. For the central apertures of the sub-electrodes it holds:

REFERENCES:
patent: 4626738 (1986-12-01), Gerlach
patent: 5146133 (1992-09-01), Shirai et al.
patent: 5347202 (1994-09-01), Stil
patent: 5539285 (1996-07-01), Iguchi et al.

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